如何在Swift中映射这个JSON？

import Foundation

struct Person: Codable {
    let name: String
    let age: Int
    let address: String?
}

let jsonString = """
{
    "name": "John",
    "age": 30
}
"""

let jsonData = jsonString.data(using: .utf8)!

do {
    let decoder = JSONDecoder()
    let person = try decoder.decode(Person.self, from: jsonData)
    print(person.name)      // 输出: John
    print(person.age)       // 输出: 30
    print(person.address)   // 输出: nil
} catch {
    print("JSON decoding error: \(error)")
}